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contract ERC20:
_balances: Map<address, u256>
_allowances: Map<address, Map<address, u256>>
_total_supply: u256
_name: String<100>
_symbol: String<100>
_decimals: u8
event Approval:
idx owner: address
idx spender: address
value: u256
event Transfer:
idx from: address
idx to: address
value: u256
pub fn __init__(name: String<100>, symbol: String<100>):
self._name = name
self._symbol = symbol
self._decimals = u8(18)
self._mint(msg.sender, 1000000000000000000000000)
pub fn name() -> String<100>:
return self._name.to_mem()
pub fn symbol() -> String<100>:
return self._symbol.to_mem()
pub fn decimals() -> u8:
return self._decimals
pub fn totalSupply() -> u256:
return self._total_supply
pub fn balanceOf(account: address) -> u256:
return self._balances[account]
pub fn transfer(recipient: address, value: u256) -> bool:
self._transfer(msg.sender, recipient, value)
return true
pub fn allowance(owner: address, spender: address) -> u256:
return self._allowances[owner][spender]
pub fn approve(spender: address, value: u256) -> bool:
self._approve(msg.sender, spender, value)
return true
pub fn transferFrom(sender: address, recipient: address, value: u256) -> bool:
assert self._allowances[sender][msg.sender] >= value
self._transfer(sender, recipient, value)
self._approve(sender, msg.sender, self._allowances[sender][msg.sender] - value)
return true
pub fn increaseAllowance(spender: address, addedValue: u256) -> bool:
self._approve(msg.sender, spender, self._allowances[msg.sender][spender] + addedValue)
return true
pub fn decreaseAllowance(spender: address, subtractedValue: u256) -> bool:
self._approve(msg.sender, spender, self._allowances[msg.sender][spender] - subtractedValue)
return true
fn _transfer(sender: address, recipient: address, value: u256):
assert sender != address(0)
assert recipient != address(0)
self._before_token_transfer(sender, recipient, value)
self._balances[sender] = self._balances[sender] - value
self._balances[recipient] = self._balances[recipient] + value
emit Transfer(ctx, from: sender, to: recipient, value: value)
fn _mint(ctx: Context, account: address, value: u256):
assert account != address(0)
self._before_token_transfer(address(0), account, value)
self._total_supply = self._total_supply + value
self._balances[account] = self._balances[account] + value
emit Transfer(ctx, from: address(0), to: account, value: value)
fn _burn(ctx: Context, account: address, value: u256):
assert account != address(0)
self._before_token_transfer(account, address(0), value)
self._balances[account] = self._balances[account] - value
self._total_supply = self._total_supply - value
emit Transfer(ctx, from: account, to: address(0), value)
fn _approve(ctx: Context, owner: address, spender: address, value: u256):
assert owner != address(0)
assert spender != address(0)
self._allowances[owner][spender] = value
emit Approval(ctx, owner, spender, value)
fn _setup_decimals(decimals_: u8):
self._decimals = decimals_
fn _before_token_transfer(from: address, to: address, value: u256):
pass